CN203048434U

CN203048434U - Emergency shutdown protection circuit of electric single beam crane

Info

Publication number: CN203048434U
Application number: CN 201220682182
Authority: CN
Inventors: 马永红; 赵雁俊; 郑才君
Original assignee: Chongqing Crane Works Co Ltd
Current assignee: Chongqing Crane Works Co Ltd
Priority date: 2012-12-11
Filing date: 2012-12-11
Publication date: 2013-07-10
Anticipated expiration: 2022-12-11

Abstract

The utility model discloses an emergency shutdown protection circuit of an electric single beam crane. The protection circuit is characterized by comprising a contact of a contactor KA which is arranged in front of a forward rotation contactor K1 and a backward rotation contactor K2 in a crane control box circuit, wherein the contactor KA is powered by a circuit which is connected between a total contactor K0 and an scram button JTA in a calabash control box circuit; and when the scram button JTA is pressed, a contact of the total contactor K0 is disconnected, the contactor KA is powered off, the contact of the contactor KA is disconnected, and the power supply of a crane motor is off so as to stop the crane. The circuit is simple in structure, and the power supply of the crane motor can be effectively turned off when a main contact of the forward rotation contactor K1 or the backward rotation contactor K2 of the crane is closed, so that the system operation safety is fully ensured.

Description

A kind of mono beam overhead crane cart emergency stop protection circuit

Technical field

The utility model relates to a kind of protective circuit.

Background technology

The lifting mechanism of existing mono beam overhead crane all adopts electric block, and electric block is a finished product of cucurbit manufacturer production, and the energising back just can be used separately.Establish total contactless switch, voltage transformer, cucurbit lifting contactless switch, cucurbit operation conversing contactor in the electric cabinet that electric block carries.Main breaker, cart are set in the control box of hoisting crane move positive contactor K1, counter-rotating contactless switch K2.The power supply of whole hoisting crane inserts the control box of hoisting crane, 1L1,1L2,1L3 access behind the main breaker of the power supply of cucurbit in the control box of hoisting crane.As shown in Figure 3, the torch door is contained on the cucurbit, reserves action button 5QA, the 6QA of cart on the torch door.Car load control loop voltage is provided by the voltage transformer in the cucurbit control box, and the control of cart need be drawn from the cucurbit control box by cable, as among Fig. 2 and Fig. 3 14,, shown in 16,1.

Start and stop element all at the cucurbit control box.Under the normal situation of contactless switch, when needing sudden stop, press the scram button JTA on the torch door, disconnect total contactless switch K0 coil power, the control loop dead electricity, each mechanism's conversing contactor disconnects, and the motor outage stops.

But this kind structure causes following problem easily:

(1) because conversing contactor is wanted frequent adhesive, disconnection, the contact electric current changes greatly, and is bonding easily.Bonding when the positive contactor K1 of cart or counter-rotating contactless switch K2 main contact, even take scram button, disconnect control loop voltage, cart control contactor main contact can't separate.Big mechanism of car will be walked towards a direction always.

(2) if the operating personal reflection rapidly, is controlled the circuit breaker of hoisting crane power supply in the workshop switch box of leaving behind, the power supply of the hoisting crane that breaks, hoisting crane just can stop.If but the slow or workshop switch box distance of operating personal reaction, the power supply of hoisting crane has little time to break, hoisting crane has been walked far, if hang lift heavy thing and highly very low on the suspension hook, will occur hurting sb.'s feelings, breaking wayside equipment, bump car bumper device during this time, damage consequence such as factory building, even can occur that car bumper is hit mashed back hoisting crane and run out of the situation that track falls down.

The utility model content

It is a kind of after cart forward or reverse main noddle on contactor is bonding that the purpose of this utility model is to provide, and the scram button of pressing the torch door just can disconnect the cargo motor power supply, the mono beam overhead crane cart emergency stop protection circuit that cart is stopped.

To achieve these goals; by the following technical solutions: a kind of mono beam overhead crane cart emergency stop protection circuit; it is characterized in that: described protective circuit comprises the contact that is arranged in the hoisting crane control box circuit contactless switch KA before positive contactor K1 and the counter-rotating contactless switch K2 contact; contactless switch KA is by the circuit supply that is connected in the cucurbit control box circuit between total contactless switch K0 and the scram button JTA; press scram button JTA; total contactless switch K0 contact disconnects; contactless switch KA outage; contactless switch KA contact disconnects; the cargo motor power supply that breaks is realized stopping.

The utility model is simple in structure, can actv. closes the cargo motor power supply when the positive contactor K1 of cart or counter-rotating contactless switch K2 main contact are bonding, has fully ensured the safety of system's operation.

Description of drawings

Fig. 1 is hoisting crane control box power circuit schematic diagram in the prior art;

Fig. 2 is hoisting crane control box control circuit schematic diagram in the prior art;

Fig. 3 is cucurbit control box schematic circuit diagram in the prior art;

Fig. 4 is hoisting crane control box power circuit schematic diagram in the utility model;

Fig. 5 is hoisting crane control box control circuit schematic diagram in the utility model.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described further:

As shown in Figure 4 and Figure 5; a kind of mono beam overhead crane cart emergency stop protection circuit; described protective circuit comprises hoisting crane control box circuit and cucurbit control box circuit; a kind of mono beam overhead crane cart emergency stop protection circuit; described protective circuit comprises the contact that is arranged in the hoisting crane control box circuit contactless switch KA before positive contactor K1 and the counter-rotating contactless switch K2 contact; contactless switch KA is by the circuit supply that is connected in the cucurbit control box circuit between total contactless switch K0 and the scram button JTA; one starts hoisting crane; contactless switch KA contact is with regard to adhesive; closed always after this probe of contactor starts, contact is not easy bonding.Press scram button JTA, total contactless switch K0 contact disconnects, the control loop outage, and contactless switch KA contact disconnects, and the cargo motor power supply that breaks is realized stopping.

Claims

1. mono beam overhead crane cart emergency stop protection circuit; it is characterized in that: described protective circuit comprises the contact that is arranged in the hoisting crane control box circuit contactless switch KA before positive contactor K1 and the counter-rotating contactless switch K2 contact; contactless switch KA is by the circuit supply that is connected in the cucurbit control box circuit between total contactless switch K0 and the scram button JTA; press scram button JTA; total contactless switch K0 contact disconnects; contactless switch KA outage; contactless switch KA contact disconnects; the cargo motor power supply that breaks is realized stopping.